Accession Number:

ADA034491

Title:

Vulnerability of Surface Effect Vehicles to Explosion-Generated Water Waves.

Descriptive Note:

Interim rept.,

Corporate Author:

TETRA TECH INC PASADENA CALIF

Personal Author(s):

Report Date:

1976-11-01

Pagination or Media Count:

155.0

Abstract:

The objective of the study is to investigate the response of a typical surface effect vehicle SEV to an explosion wave environment. The present report deals with the first phase of the investigation, which covers the following two basic tasks a analytical description and modeling of explosion-generated water waves, and b analytical treatment of SEV dynamics and motions when subjected to a disturbing function as defined in a above. The generation of surface waves due to an explosion is modeled mathematically as a function of the explosive yield, detonation depth and water depth. Further, the dynamic property of the propagated waves is treated to vary with the local water depth. The dynamics of SEV are modeled mathematically by considering the vehicle a rigid body having six degrees of freedom in space, subject to an appropriate constraint derived from the cushion air dynamics as well as to the environmental excitations due to waves. Non-linear contributions including effects due to large motions, viscous flows, and control logics are considered and the ship responses are solved numerically through time domain integrations. Sample examples have been exercised using this analytic model to examine the effects of several chosen environments on an SEV and the results are presented herein. Author

Subject Categories:

  • Surface Effect Vehicles and Amphibious Vehicles
  • Explosions
  • Fluid Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE